Tool-holder for planers and other machine-tools.



J.CARR. TOOL HOLDER FOR PLANERS AND OTHER MAGHINE TOOLS.

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1,045,512. Patented Nov. 26, 1912.

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JAMES CARE, OF SYRACUSE, NEW YORK,

ASSIGNOR TO THE HENRY Gr. THOMPSON &

SON COMPANY, OF NEW HAVEN, CONNECTICUT, A CORPORATION OF CONNECTICUT.

Specification of Letters Patent.

Patented Nov. 26, 1912.

Application filed February 15, 1912. Serial No. 677,734.

v To all whom it may concern:

Be it known that I, JAMES CARR, a citizen of the United States, and resident of Syracuse, New York, have invented certain new and useful Improvements in Tool-Holders for Planers and other Machine-Tools, (Case 13,) of which the following is a-specification, accompanied by drawings.

In planers and other machine tools, it is desirable to have the tool held very rigidly but in such a manner that it may be taken out to be sharpened or changed without disturbing the setting of the tool holder; The present invention provides for this in a very simple and efiicient manner, and in its preferred form accommodates the tool holder to different sizes and cross sections of the tool. Certain other features of the invention in the preferred form will appear from the following description and claims.

In the accompanying drawings, Figure 1 .is a view of the holder showing part of the shank broken off, Fig. 2 is a front View of the same, Fig. 3 is a detail view of the head of the holder with the attached parts removed, Fig. 4: is a view of the auxiliary holder, and Fig. 5 is a view on smallerscale of the holder modified by having two slots instead of one.

I will describe only the preferred form of my invention as designed particularly for the planing machine.

At 6 is shown the shank of the tool holder, which is preferably rectangular in cross section and of suflicient length, as will be well understood, to enable it to be readily and rigidly held in the adjustable parts of the machine in which the holder is set. At the forward end, the shank I) has an enlarged end or head which carries the movable jaw. At one side and from the top, the head is rabbeted or cut away to receive the tool and form the lower jaw c, the upper surface of which is undercut or inclined inward, as best seen in Fig. 2. At the rear end of the cutaway portion a perpendicular abutting face d is left to receive the heel of the tool or a spacing piece, if desired, behind the tool when the tool is short. The upper jaw f is undercut to correspond oppositely to the undercut lower jaw c and is provided with a fulcrum lip g projecting downward into a recess in the head. A suitable bolt 72. and nut j are provided for actuating the jaws to clamp the tool, as will be well understood.

jaws. This auxiliary The bolt hole in the head of the shank is shown at 7c. Preferably the top of the head is cut down slightly, forming a shoulder Z which fits against one of the faces of the upper jaw and helps to keep the head in place when the bolt is loosened.

The largest size of tool steel for which the holder is adapted should be of cross section to fit the jaws without interposingan auxiliary tool holder, and the invention as so far described is, therefore, useful without as well as with the auxiliary holder in combination as hereafter described.

At m is shown a tool of approximately rectangular cross section held in the jaws of the holder with the aid of an intermediate auxiliary holder which is fitted internally to the tool and externally to thetool holder tool holder comprises a side p, which is preferably slotted, as at g, to allow it to readily spring under the action of the-jaws. It also has two parts, 0, s, which lie above and below the tool between the tool and the respective jaws of the holder. These have divergent inclined surfaces so as to fit the jaws of the tool holder and to be drawn by the effect of the inclines toward the tool holder when clamped in the jaws. Internally, the auxiliary or intermediate tool holder should fit the tool on three sides. Externally, it should fit the upper and lower jaws respectively. If desired, several different cross sections of tool steel may be used with several corresponding auxiliary tool holders. It will be seen that the auxiliary tool holder may be adjusted lengthwise of the tool and of the jaws, and it is preferably beveled or tapered toward the tool at its forward end, as shown at t, and the part c projected forward beneath the tool, as at s, to give additional support to the tool, the taper allowing it to be advanced very closely to the work and to the cutting edge of the tool.

In practice, the operation of my improved tool holder may be, as follows: The tool is placed in the auxiliary tool holder and then placed with the auxiliary holder in the jaws of the main holder. As the jaws are clamped together, the auxiliary holder springs, slightly, clamping the tool within the jaws, and, owing to the inclined faces of the undercut jaws and of the auxiliary holder, the tool is held and firmly pressed laterally against the head of the tool holder. The shank of the tool holder being properly adjusted and set for operation upon the work in the machine tool, it will be apparent that the tool m is very firmly held without danger of chattering. When, however, the tool needs resharpening, it can, of course, be taken from the holder, sharpened and restored accurately to its cutting position without disturbing the setting of the tool holder.

In Fig. 5 a slight modification is shown, in which an additional slot 9, parallel with the slot g, is present in order to give greater spring to the auxiliary tool holder.

I claim and desire to secure the following:

1. A tool holder comprising a tool holding head having an undercut jaw, and an opposing movable jaw also undercut, and an auxiliary tool holder internally fitted to the appropriate tool and externally fitting the jaws and which is open on the side toward the head and has divergent inclined surfaces that cooperate with the undercut jaws tending to draw the tool against the head in the clamping action of the jaws, said auxiliary holder being adapted to yield under clamping pressure of the jaws to grip the tool within it.

2. A tool holder comprising a shank, a head having'a jaw, an opposed jaw coop erating therewith, a yielding auxiliary holder or clamp fitted to the said jaws and internally fitted to receive the tool and having an opening throughout its length on one side and on the other side partially open or separated throughout a large portion of its length and adapted to yield and be clamped on the tool when in said jaws. v

3. A tool holder comprising a shank adapted to be secured in a machine and a head, said head and shank being cut away on one side forming a long recess to receive a tool and being undercut forming an undercut jaw at the cutaway portion, an opposing undercut jaw adjustably mounted upon the head, and means for imparting relative movement to the jaws.

4. A tool holder comprising a shank for securing it, and a pair of aws, and an aux iliary tool holder adapted to fit said jaws, said auxiliary tool holder having parts internally adapted to fit a tool upon three sides when the auxiliary tool holder is clamped in said jaws, and externally having transversely divergent inclined surfaces, and being partially opened or separated through a large portion of its length to permit it to yield under the action of the jaws, and said jaws being adapted to act upon the said inclined surfaces, and means for clamping the jaws thereon.

In testimony whereof I have signed this specification in the presence of two subscribing witnesses this 9th day of February, 1912,

JAMES CARR.

Witnesses: v

HAROLD BINNEY, AUous'rA PsoHIERER.

Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents.

Washington, D. 0. 

